USB CABLE

USB
stands for Universal Serial Bus. USB replaces all
the different kinds of serial and parallel port connectors
with one standardized plug and port combination. With
USB-compliant PCs and peripherals, you just plug them
in and turn them on. USB makes the whole process automatic.
It's like adding instant new capabilities to your
PC.

Supports
up to 127 external PC peripherals.

Industry standard will take the guesswork out of
expanding PC functionality.

The
full speed USB bandwidth (up to 12 Mbps) can support
a wide range of multimedia and telephone USB devices.
The low-speed bandwidth (up to 1.5 Mbps) can support
low-cost, low-end devices such as USB keyboard and
mice. Simultaneously, USB ports will support both
full-speed and low-speed devices .

Connector:

Two
types of plugs and receptacles are specified for USB:
A Type and B Type. The shielded cable connector will
be 4 positions with gold-plated contacts---2 for single
on 2mm centerline, 2 for power on 2.5mm centerline.

A
Type Plug used for those devices (keyboard, mouse,
joystick etc...) on which the external cable is permanently
attached.

B
Type Plug used for those devices (printer, scanner,
modem etc...) that requires an external connector,
so that USB cabling is detachable.

Cable:

There are two kinds of cable: Fully-rated
and sub-channel. The Main difference between
them is that fully-rated can be used for typical peripherals
operating at the rated 12 Mbps signaling, while sub-channel
1.5 Mbps signaling.

Maximum
cable length shall not exceed 3M for sub channel or 5M
for the fully channel.

The
Shield must be terminated to the connector plug for
completed assemblies.